[Xen-devel] [PATCH v3 51/62] arm/acpi: Prepare EFI system table for Dom0

[shannon.zhao@xxxxxxxxxx]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c |  2 ++
 xen/common/efi/boot.c       | 64 +++++++++++++++++++++++++++++++++++++++++++++
 xen/include/asm-arm/setup.h |  3 +++
 3 files changed, 69 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index da4e271..9d667ea 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1735,6 +1735,8 @@ static int prepare_acpi(struct domain *d, struct 
kernel_info *kinfo)
         return rc;
 
     acpi_map_rest_tables(d);
+    acpi_create_efi_system_table(d->arch.efi_acpi_gpa, d->arch.efi_acpi_table,
+                                 tbl_add);
 
     return 0;
 }
diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index 6a48624..75835ae 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -1192,6 +1192,70 @@ int __init estimate_efi_size(int mem_nr_banks)
 
     return size;
 }
+
+static uint32_t __init xz_crc32(uint8_t *buf, size_t size, uint32_t crc)
+{
+    uint32_t xz_crc32_table[256];
+    const uint32_t poly = 0xEDB88320;
+    uint32_t i;
+    uint32_t j;
+    uint32_t r;
+
+    for (i = 0; i < 256; ++i) {
+        r = i;
+        for (j = 0; j < 8; ++j)
+            r = (r >> 1) ^ (poly & ~((r & 1) - 1));
+
+        xz_crc32_table[i] = r;
+    }
+
+    crc = ~crc;
+    while (size != 0) {
+            crc = xz_crc32_table[*buf++ ^ (crc & 0xFF)] ^ (crc >> 8);
+            --size;
+    }
+
+    return ~crc;
+}
+
+void __init acpi_create_efi_system_table(paddr_t paddr, void *efi_acpi_table,
+                                         struct membank tbl_add[])
+{
+    u64 table_addr, table_size, offset = 0;
+    u8 *base_ptr;
+    EFI_CONFIGURATION_TABLE *efi_conf_tbl;
+    EFI_SYSTEM_TABLE *efi_sys_tbl;
+    EFI_SYSTEM_TABLE *est = (EFI_SYSTEM_TABLE *)maddr_to_virt(efi.est);
+
+    table_addr = paddr + acpi_get_table_offset(tbl_add, TBL_EFIT);
+    table_size = sizeof(EFI_SYSTEM_TABLE) + sizeof(EFI_CONFIGURATION_TABLE)
+                 + sizeof(XEN_EFI_FW_VENDOR);
+    base_ptr = efi_acpi_table + acpi_get_table_offset(tbl_add, TBL_EFIT);
+    efi_sys_tbl = (EFI_SYSTEM_TABLE *)base_ptr;
+
+    memcpy((EFI_TABLE_HEADER *)&(efi_sys_tbl->Hdr),
+           (EFI_TABLE_HEADER *)&(est->Hdr), sizeof(EFI_TABLE_HEADER));
+    efi_sys_tbl->Hdr.HeaderSize = table_size;
+
+    efi_sys_tbl->FirmwareRevision = est->FirmwareRevision;
+    efi_sys_tbl->NumberOfTableEntries = 1;
+    offset += sizeof(EFI_SYSTEM_TABLE);
+    memcpy((u16 *)(base_ptr + offset), XEN_EFI_FW_VENDOR,
+           sizeof(XEN_EFI_FW_VENDOR));
+    efi_sys_tbl->FirmwareVendor = (CHAR16 *)(table_addr + offset);
+
+    offset += sizeof(XEN_EFI_FW_VENDOR);
+    efi_conf_tbl = (EFI_CONFIGURATION_TABLE *)(base_ptr + offset);
+    efi_conf_tbl->VendorGuid = (EFI_GUID)ACPI_20_TABLE_GUID;
+    efi_conf_tbl->VendorTable = (VOID *)tbl_add[TBL_RSDP].start;
+    efi_sys_tbl->ConfigurationTable = (EFI_CONFIGURATION_TABLE *)(table_addr
+                                                                  + offset);
+    efi_sys_tbl->Hdr.CRC32 = xz_crc32((uint8_t *)efi_sys_tbl,
+                                      efi_sys_tbl->Hdr.HeaderSize, 0);
+
+    tbl_add[TBL_EFIT].start = table_addr;
+    tbl_add[TBL_EFIT].size = table_size;
+}
 #endif
 
 #ifndef CONFIG_ARM /* TODO - runtime service support */
diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h
index b759813..2d65796 100644
--- a/xen/include/asm-arm/setup.h
+++ b/xen/include/asm-arm/setup.h
@@ -53,6 +53,9 @@ void copy_from_paddr(void *dst, paddr_t paddr, unsigned long 
len);
 
 int estimate_efi_size(int mem_nr_banks);
 
+void acpi_create_efi_system_table(paddr_t paddr, void *efi_acpi_table,
+                                  struct membank tbl_add[]);
+
 int construct_dom0(struct domain *d);
 
 void discard_initial_modules(void);
-- 
2.1.0


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